kuài
Kuài is a Chinese word with multiple meanings, most commonly translating to "fast" or "quick" when used as an adjective or adverb. It can describe actions, movements, or processes that are completed in a short amount of time. For example, "kuài diǎn" means "quickly" or "hurry up." In a different context, kuài can also refer to a unit of currency in Hong Kong, the Hong Kong dollar, which is often colloquially referred to as "kuài" in everyday conversation. This usage is similar to how "buck" is used for the US dollar in English.
Beyond speed and currency, kuài can also describe something as "sharp" or "steep" depending on the context